conversion for pointer to a function for member function of one class to another

I already implemented successfully by use of std::bind and function object.But i want to do with function pointer. I am not able to do with funtion pointer, facing problem while registering call back.

class A{ public: int id; A(){}; typedef void(*fptr_t)(void); // function pointer fptr_t f1=NULL; void operator()(int i) //using functors
{ id=i; cout<<"Object number "<

    void call_bk_handler(fptr_t fp)
    {
      f1= fp;
    }

......... };

class B {

public:


B(int N):baseObj(N),m_total_clicks(0),m_clicks(N,0)
{
   for(int i=0;i<N;i++)
    {
        A[i](i); // using functors;
        A[i].call_bk_handler(&B::callBack); // this is not working
     }

void callBack(){ ............. };

} std::vectorbasedObj; public: int m_total_clicks;

    std::vector<int>m_clicks;
    int count=0;